ŠKODA, Radek, Jan CEMPÍREK, Jan FILIP, Milan NOVÁK, Frantisek VESELOVSKY and Radim CTVRTLIK. Allanite-(Nd), CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), a new mineral from Askagen, Sweden. American Mineralogist. CHANTILLY: Mineralogical Society of America, 2012, vol. 97, 5-6, p. 983-988. ISSN 0003-004X. Available from: https://dx.doi.org/10.2138/am.2012.3936.
Other formats:   BibTeX LaTeX RIS
Basic information
Original name Allanite-(Nd), CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), a new mineral from Askagen, Sweden
Authors ŠKODA, Radek (203 Czech Republic, guarantor, belonging to the institution), Jan CEMPÍREK (203 Czech Republic), Jan FILIP (203 Czech Republic), Milan NOVÁK (203 Czech Republic, belonging to the institution), Frantisek VESELOVSKY (203 Czech Republic) and Radim CTVRTLIK (203 Czech Republic).
Edition American Mineralogist, CHANTILLY, Mineralogical Society of America, 2012, 0003-004X.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10500 1.5. Earth and related environmental sciences
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 2.204
RIV identification code RIV/00216224:14310/12:00057153
Organization unit Faculty of Science
Doi http://dx.doi.org/10.2138/am.2012.3936
UT WoS 000304212900020
Keywords in English Epidote supergroup; allanite; neodymium; pegmatite; Askagen
Tags AKR, rivok
Tags International impact, Reviewed
Changed by Changed by: prof. RNDr. Milan Novák, CSc., učo 36021. Changed: 4/4/2013 07:39.
Abstract
Allanite-(Nd), ideally CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), the Nd-analog of allanite-(Ce), occurs in the Askagen pegmatite, central Sweden. It forms fine-grained aggregates within altered thalenite-(Y). The other associated minerals include: iimoriite-(Y), keiviite-(Y), allanite-(Y), and tengerite-(Y). Allanite-(Nd) is biaxial (-); with refractive indices alpha = 1.723(5), beta = 1.754(7), gamma = 1.772(5), and measured 2V = 82 degrees(+/- 3 degrees). Larger fragments of allanite-(Nd) are moderately pleochroic (alpha = pale grayish-brown, gamma = grayish-brown); small fragments are colorless. Allanite-(Nd) is monoclinic, space group P2(1)/m, with the following unit-cell parameters: a = 8.8897(5), b = 5.7308(2), c = 10.1010(6) angstrom, beta = 115.166(7)degrees, V = 465.75(4) angstrom(3), Z = 2. The strongest five peaks from the X-ray powder diffraction patterns [d (angstrom)(I)(hkl)] are: 3.51(46)((2) over bar 11), 2.89(100)((1) over bar 13), 2.87(45)(020), 2.70(60)(120), 2.61(60)((3) over bar 11). Allanite-(Nd) has a density of 3.98 g/cm(3), vitreous luster, grayish-brown streak, and the Mohs hardness is ca. 6. It is brittle, with imperfect cleavage, and conchoidal fracture. The Mossbauer spectroscopy revealed Fe3+/Fe-101 ratio of 0.27 in the type sample. The refined empirical formula of the crystal used for the structure determination is: Al(Ca0.957Mn0.043)Sigma(A2)(1.000)(Nd0.337Ca0.154Sm0.131Ce0.125Y0.112Gd0.062Pr0.051DY0.016La0.007Er0.005)(Sigma 1.000) M1(Al0.860Fe0.1403+)(Sigma 1.000)Al-M2(M3)(Fe(0.760)(2+)Al(0.112)Fer(0.070)(3+)Mg(0.058))(Sigma 1.000)(Si3O11.978)-Si-T1,2,3(OH)(1.032). The allanite-(Nd) was approved by CNMNC (IMA 2010-060).
Links
KJB301630801, research and development projectName: Interakce metamiktních minerálů s hydrotermálnímy fluidy a její význam geologickém prostředí
Investor: Academy of Sciences of the Czech Republic, The interaction of metamict minerals and hydrothermal fluids and its significance in the geological environment
MUNI/A/1060/2009, interní kód MUName: Posílení a zkvalitnění tvůrčí činnosti studentů PřF v oborech matematika, fyzika a vědy o Zemi (Acronym: KVAS-MPG)
Investor: Masaryk University, Category A
PrintDisplayed: 3/7/2024 13:43